Alright, let's work through 2839 times 257 step by step
2839 × 257 = 257 × (2839)
+ 257 × 9 which equals 2313
+ 257 × 30 that results in 7710
+ 257 × 800 producing 205600
+ 257 × 2000 yielding 514000

= 729623
